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Export to a BACPAC file - Azure SQL Database and Azure SQL Managed Instance

  • Članak

Applies to: Azure SQL Database Azure SQL Managed Instance

When you need to export a database for archiving or for moving to another platform, you can export the database schema and data to a BACPAC file. A BACPAC file is a ZIP file with an extension of BACPAC containing the metadata and data from the database. A BACPAC file can be stored in Azure Blob storage or in local storage in an on-premises location and later imported back into Azure SQL Database, Azure SQL Managed Instance, or a SQL Server instance.

Considerations

  • For an export to be transactionally consistent, you must ensure either that no write activity is occurring during the export, or that you are exporting from a transactionally consistent copy of your database.

  • If you are exporting to blob storage, the maximum size of a BACPAC file is 200 GB. To archive a larger BACPAC file, export to local storage with SqlPackage.

  • Exporting a BACPAC file to Azure premium storage using the methods discussed in this article is not supported.

  • Storage behind a firewall is currently not supported.

  • Immutable storage is currently not supported.

  • Storage file name or the input value for StorageURI should be fewer than 128 characters long and cannot end with '.' and cannot contain special characters like a space character or '<,>,*,%,&,:,,/,?'.

  • If the export operation exceeds 20 hours, it may be canceled. To increase performance during export, you can:

    • Temporarily increase your compute size.
    • Cease all read and write activity during the export.
    • Use a clustered index with non-null values on all large tables. Without clustered indexes, an export may fail if it takes longer than 6-12 hours. This is because the export service needs to complete a table scan to try to export entire table. A good way to determine if your tables are optimized for export is to run DBCC SHOW_STATISTICS and make sure that the RANGE_HI_KEY is not null and its value has good distribution. For details, see DBCC SHOW_STATISTICS.

  • Azure SQL Managed Instance does not currently support exporting a database to a BACPAC file using the Azure portal or Azure PowerShell. To export a managed instance into a BACPAC file, use SQL Server Management Studio (SSMS) or SQLPackage.

  • For larger databases, BACPAC export/import may take a long time, and may fail for various reasons.

Note

BACPACs are not intended to be used for backup and restore operations. Azure automatically creates backups for every user database. For details, see business continuity overview and SQL Database backups.

Note

Import and Export using Private Link is in preview.

The Azure portal

Exporting a BACPAC of a database from Azure SQL Managed Instance using the Azure portal is not currently supported. See Considerations.

Note

Machines processing import/export requests submitted through the Azure portal or PowerShell need to store the BACPAC file as well as temporary files generated by the Data-Tier Application Framework (DacFX). The disk space required varies significantly among databases with the same size and can require disk space up to three times the size of the database. Machines running the import/export request only have 450GB local disk space. As a result, some requests may fail with the error There is not enough space on the disk. In this case, the workaround is to run SqlPackage on a machine with enough local disk space. We encourage using SQLPackage to import/export databases larger than 150GB to avoid this issue.

  1. To export a database using the Azure portal, open the page for your database and select Export on the toolbar.

    Screenshot that highlights the Export button.

  2. Specify the BACPAC filename, select an existing Azure storage account and container for the export, and then provide the appropriate credentials for access to the source database. A SQL Server admin login is needed here even if you are the Azure admin, as being an Azure admin does not equate to having admin permissions in Azure SQL Database or Azure SQL Managed Instance.

    Database export

  3. Select OK.

  4. To monitor the progress of the export operation, open the page for the server containing the database being exported. Under Data management, select Import/Export history.

SQLPackage utility

We recommend the use of the SQLPackage utility for scale and performance in most production environments. You can run multiple SqlPackage commands in parallel for subsets of tables to speed up import/export operations.

To export a database in SQL Database using the SQLPackage command-line utility, see Export parameters and properties. The SQLPackage utility is available for Windows, macOS, and Linux.

This example shows how to export a database using SqlPackage with Active Directory Universal Authentication:

SqlPackage /a:Export /tf:testExport.BACPAC /scs:"Data Source=apptestserver.database.windows.net;Initial Catalog=MyDB;" /ua:True /tid:"apptest.onmicrosoft.com"

Azure Data Studio

Azure Data Studio is a free, open-source tool and is available for Windows, Mac, and Linux. The "SQL Server dacpac" extension provides a wizard interface to SqlPackage operations including export and import. See the extension's documentation page for more information on installing and using the extension.

SQL Server Management Studio (SSMS)

The newest versions of SQL Server Management Studio provide a wizard to export a database in Azure SQL Database or a SQL Managed Instance database to a BACPAC file. See the Export a Data-tier Application.

PowerShell

Exporting a BACPAC of a database from Azure SQL Managed Instance using PowerShell is not currently supported. See Considerations.

Use the New-AzSqlDatabaseExport cmdlet to submit an export database request to the Azure SQL Database service. Depending on the size of your database, the export operation may take some time to complete.

$exportRequest = New-AzSqlDatabaseExport -ResourceGroupName $ResourceGroupName -ServerName $ServerName `
  -DatabaseName $DatabaseName -StorageKeytype $StorageKeytype -StorageKey $StorageKey -StorageUri $BacpacUri `
  -AdministratorLogin $creds.UserName -AdministratorLoginPassword $creds.Password

To check the status of the export request, use the Get-AzSqlDatabaseImportExportStatus cmdlet. Running this cmdlet immediately after the request usually returns Status: InProgress. When you see Status: Succeeded the export is complete.

$exportStatus = Get-AzSqlDatabaseImportExportStatus -OperationStatusLink $exportRequest.OperationStatusLink
[Console]::Write("Exporting")
while ($exportStatus.Status -eq "InProgress")
{
    Start-Sleep -s 10
    $exportStatus = Get-AzSqlDatabaseImportExportStatus -OperationStatusLink $exportRequest.OperationStatusLink
    [Console]::Write(".")
}
[Console]::WriteLine("")
$exportStatus

Cancel the export request

Use the Database Operations - Cancel API or the PowerShell Stop-AzSqlDatabaseActivity command to cancel an export request. Here is an example PowerShell command:

Stop-AzSqlDatabaseActivity -ResourceGroupName $ResourceGroupName -ServerName $ServerName -DatabaseName $DatabaseName -OperationId $Operation.OperationId

Note

To cancel export operation you will need to have one of the following roles:

Next steps